Submarine cable



Patented June 28, 1938 UNITED STATES PATENT OFFICE SUBMARINE CABLE Ernst Studt, Nordenham, Oldenburg, Germany, assignor to Norddeutsche Seekabelwerke Aktiengesellschaft, Nordenham, Oldenburg, Germany October 24, 1932 1 claim.

This forms a division of the copending application Serial No. 693,215 led October 11, 1933 for Submarine cables, now Patent No. 2,059,055, October 27, 1936.

This invention relates to an improved joint in the insulation of submarine cables which are insulated with guttapercha or guttapercha-like materials. The making of such joints in the insulation is one of the most difficult problems in the manufacture of submarine cables. While in the case of guttapercha cables the joints may be made by skilled operators by hand, it was necessary for the jointing of Paragutta cores to work out a special method and to design a special machine in order to obtain perfect adhesion of the surfaces overlapping one another, Hitherto it has not been possible to make periectly satisfactory joints in Paragutta cores by hand. Paragutta as dened on page 198 of Beil System Technical Journal of April 1932, :is a mixture of rubber from which the albumen has been removed, deresinated balata and wax.

New it has been found that a perfectly satisiaetory joint can be made in the insulation of Paragutta cores without special devices by using as the jointing material a mixture of guttepereha, balata or the like with polystyrol or other polymerization* products of aryl olefines. The

adhering and adhesive power of a mixture of for instance of deresinated balata with 15%'of polystyrol is so great that in all circumstances a perfectly satisfactory and watertight joint Will be formed in the case of Paragutta cores. If it should be thought necessary to increase the percentage of polystyrol in the mixture in order still further to increase the adhesive power, wax, caoutchouc or some other softening agent should be added to the mixture, as otherwise the total mixture will become too hard.

The employment oi the above-mentioned mixtures also provides advantages when making joints in guttapercha cores, as these mixtures are easier to handle than guttapercha alone.

The invention is exemplified in the drawing attached hereto showing a conductor core surrounded by cable insulation and an outer sleeve oi thermoplastic substance.

What I claim is:

A joint in theA insulation of cables which are insulated by a thermoplastic substance consisting of a mixture of albumin free rubber, deresinated balata and wax, in which the jointing material for the insulation consists of a mixture of guttapercha with polystyrol.

ERNST STUDT. 

